18209163420 has 384 divisors, whose sum is σ = 69963264000. Its totient is φ = 3916588032.

The previous prime is 18209163397. The next prime is 18209163443. The reversal of 18209163420 is 2436190281.

18209163420 is a `hidden beast` number, since 18 + 2 + 0 + 9 + 1 + 634 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (18209163397) and next prime (18209163443).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3145849 + ... + 3151631.

It is an arithmetic number, because the mean of its divisors is an integer number (182196000).

Almost surely, 2^18209163420 is an apocalyptic number.

18209163420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18209163420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34981632000).

18209163420 is an abundant number, since it is smaller than the sum of its proper divisors (51754100580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18209163420 is a wasteful number, since it uses less digits than its factorization.

18209163420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5839 (or 5817 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 18209163420 in words is "eighteen billion, two hundred nine million, one hundred sixty-three thousand, four hundred twenty".